openscenegraph - How can I capture an Image for post processing in OSG -

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i need capture image viewer , need post processing , display on it. right more interested in first part of it. capture image viewer.

while going through osg came across screencapturehandler. not able image out of it.

i still working done in case of have other way of how can done or example screencapturehandler can share.

to capture rendered view image use custom osg::camera::drawcallback.

to capture view @ point, set drawcallback on camera, force rendering, restore null callback.

notice following code part of member function of custom viewer (that's not case):

osgviewer::view::getcamera()->setfinaldrawcallback(new viewcapturecallback(img)); osgviewer::viewer::renderingtraversals(); osgviewer::view::getcamera()->setfinaldrawcallback(null);

the viewcapturecallback uses image->readpixels() read backbuffer. 

glreadbuffer( gl_back );  osg::graphicscontext* gc = renderinfo.getstate()->getgraphicscontext();  // here should process backbuffer's size , format image->readpixels(0, 0, gc->gettraits()->width, gc->gettraits()->height, pixelformat, gl_unsigned_byte);

hope helps


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